The position must involve prearranged professional work in an occupation on the USMCA professional list, and the applicant must meet that profession's specific qualification and citizenship requirements. An impressive title or years of local experience does not substitute for either element.
Compare the duties and the listed criteria side by side
Set the actual duty description next to the profession's stated qualification rule and identify which document supports each element. If the employer later changes the scope of the role, review the revised facts rather than continuing to rely on the original offer. It is possible that an initial review finds the proposed profession does not fit; the paperwork should describe the real job rather than being adjusted to manufacture a fit.
The listed engineering credential is a baccalaureate or licenciatura degree, or a state/provincial licence; the applicant must also be a Canadian or Mexican citizen seeking qualifying temporary professional work. The complication, where there is one, is procedural: a package that names one nationality in the letter and offers another at the counter raises an identity question before anyone reaches the merits of the profession or the offer.